Let's look more closely at the aperture
concept. Throughout
history, spiritual and consciousness descriptions have relied on
allegory, metaphor, and analogy. We will do the same except that
available comparative objects have been characterized by modern science
in far greater detail than objects of yore. For spiritual or
consciousness system descriptions, the thinkers in remote agricultural
based societies might have, say, chosen animals such as wolves or owls as
metaphorical symbols based on skilled knowledge of their overt
behavior. However we know those creatures down to their DNA, and
were they chosen today as spiritual or consciousness model descriptors, the animal metaphors,
allegories, and analogies could be far richer than what was possible
centuries ago. Thinkers in earlier periods drew from the knowledge
and metaphors available in their day, so why shouldn't we do the same?

So
rather than animals, let's take a look at two common
objects: the telescope and the antenna. Both of these widely understood
items capture and concentrate information. A reflector
telescope has an aperture equal to the diameter of its mirror. Light
gathered over the entire mirror surface is focused through the use of
physics principles and captured for viewing and study. Energy from a large
area is concentrated and organized for capture in a manageable small
area.

The long Yagi antenna as commonly seen around the world on
rooftops and towers adds additional interest in that its working
aperture is much larger than the antenna's physical size. The
telescope's aperture size is immediately evident as a physical
measurement. But the Yagi antenna's aperture is not actually
visible to us, at least in the visual spectrum. The notion is described qualitatively here:

"A
good example of this is the long Yagi beam antenna. Viewing it from the
front, it looks to the human eye to be no bigger than a single dipole.
Yet, its aperture is very much bigger than a dipole. The long Yagi is
what is called a Slow Wave Structure. The director elements interact
with the moving wave front to slow down the speed of radio signals whose
frequency is close to the design frequency for the antenna. This slowing
effect causes the wave front close to the directors to lag behind the
energy farther off-axis with the antenna. This causes the wave front to
become curved, like the surface of a bowl, with the open face of the
bowl facing towards the driven element. This bending of the RF wave
front acts to bring energy that initially was not directly in line with
the antenna to a focus at the driven element. It does so because energy
flow is always perpendicular to the wave front. The curvature of the
wave front has been bent (by the directors) such that the perpendicular
to the wave front points towards the driven element. Thus energy flows
to the driven element from positions considerably off-axis. Hence, a
large aperture."

The working aperture
of a common Yagi antenna is much larger than the physical antenna itself
(see page 13). An engineer can define that aperture and easily imagine it
invisibly yet functionally surrounding the antenna. Placing other
antennas or metal objects within that aperture - the "near
field" - will definitely affect
the antenna's function. The designer can modify the shape and size of
the antenna's aperture by modifying the physical structure - a key
analogical point. As with the antenna, we will imagine a virtual but
functional aperture around ourselves and every other person. There are
more detailed engineering descriptions of antenna aperture with
pictorials and mathematics here.
The latter reference doesn't specifically address the Yagi design but is a quantitative description of antenna aperture physics.
Engineering schools around the world offer antenna design course work
such as here.
Antenna aperture is a widely known and studied phenomenon.

The antenna and telescope are structures
designed for one exact function. Yet a compelling analogy suggests that a consciousness aperture
surrounds each person (or any other sentient being) not unlike the
aperture that surrounds any everyday antenna structure. In both
cases we can't "see" it, but we know it's there and active.
That consciousness aperture as it passes through time - sticking to
three dimensional concepts - is one's own temporal aperture.